Kishan, thanks for your interest. 1. This is a 8 GB version 2. I'm not sure if you need to pay an extra sum of import duty if the phone comes in a full retail packing. The shipping cost by Royal mail Air sure is about £20. (The other option would be sending you the phone and chargers, cables separately but I have not tried, it's up to you.) 3. The phone is not unlocked, but I could have it unlocked in T-mobile UK before I sent the phone to you without extra cost. But I will need to charge the phone with enough battery to do the unlock. 4. Honestly I prefer buyers in London so that they could check the phone before purchase. And this avoids the problem of VAT or import duty. I am happy to do the deal but I have to make sure you are clear about the uncertainty about import duties. Hope it's clear and helpful. Cheers